Can you commit to working with her 5 to 6 days a week? If so, and you can spend one to two hours a day doing it? Then, yes.
If you only have 5 days, don't give two off in a row.
I leg horses up by starting with walking 30 minutes, trotting 10, walking 20. After a week of this, I may go to 25 walking, 15 trotting, 20 walking. After two weeks of that, I go to 15 to 20 walking, 20 trotting, and 20 walking. I monitor the horse for respiration and heart rate with every ride.
The last two weeks, I give them an hour or two off, saddle up again, walk 10 minutes, do some loping/cantering with some trotting for 10, and walk for 10.
The trot is a working trot. No padding around the lot for us. We're also doing circles in and out, serpentines, stops, just basic horse moves.
If your grass is growing just wonderfully this time of year, you may consider putting your horse in a dry lot or stall for a few hours during the day.